Staple driving machine



May 6, 1941. F. POLZER ET AL STAPLE DRIVING MACHINE 4 Sheets-Sheet 1 Filed May 1, 1939 7/ aof 7 55 m E N R O May 6, 1941. F. POLZER ETAL STAPLE DRIVING MACHINE 4 Sheets-Shet 2 Filed May 1 May 6, 1941. F. POLZER ET AL STAPLE DRIVING MACHINE 4 Sheets-Sheet 3 Filed May 1 ATTORNEYS.

y 4 I F. POLZER ET AL 2,240,911

STAPLE DRIVING MACHINE Filed May 1, 1959 4 Sheets-Sheet 4 I II I I I/ III/ II III/[Ill ll 98 99 flp vgmon ATTORNEY-7..

Patented May 6, 1941 UNIT ED STAT ES PATENT" 0F sic E STAPLE DRIVING MAGHINE Fridolin Polzer and. Roy E; Peterson, Norwalki Cbnn.,.assignors .to- The E'. H. Hotchkiss Company, Norwalk, Conn, a corporation of. Connecti'cut ApplicationrMa y 1, 1939, Serial No. 270,970

15.Cl'aims. (oi. 1--3) This?inventionrelates'toastaplerdriving ma- Fig. 14 is a vertical-section substantially on china; such 'for example as is used for driving line |4-l4-of.Fig. 2; substantially-U -shaped staples; and maybe used Fig. 15 is aperspective view of the staple so-calledf stapling machine to drive and driver;

clinch the staples :or as a so-called tacking ma- Fig. 16 is a top plan view of the follower on chine to drive. thestaples' through articles to'be the staple slide;

attached to wood or similar material without Fig, 17' is. a longitudinal verticalsection of the clinching; It ista further development of and front portion of the machine similar to Fig. 2 improvement on the construction disclosed in showing; the plunger in the lower. position and our: prior application with Lester L. Wheeler, 0 the-.rear'portion'of themachine being-shown in S eria1 "N O+2U9;886; filed May 25, 1938. elevation;

An object-of the invention" is to provide an Fig: 1-8- isa vertical cross section substantially improved" and simplified construction of staple online- I'8l'8of Fig. 2;: driving machine, and'onea which may be made Fig. 19'is"a vertical cross section substantially almost entirely as a press job and with parts on line 19 -|90fFi'g;2;: welded together, thus eliminating the use. of Fig. 20 isa vertical: longitudinalsection on an castingsand making alighter and stronger conenlarged? scale of the rear portion of f the slide structibnsfcr-theamount ofmetal used". substantially on l ne. -20 of Figthe-foregoing and other objects in view Fig. 21. isa: longitudinal section thereof sub.- we have devised a construction asillustrated in 20 StaIIti'aUY'OII e 2l'2l of'FigI theacc'ompanying drawings forming a part of Fig. 22Eis'a; section similar to'Fig; 20; showing this-specification, but it will be -understood that the' staple, slide released and moved. forward a various changes" andmodifi'cations may be emshort 'distance; ployed within the scope of the invention. Fig. 23* is a transverse: section substantially Inth'ese drawings: on line 23 -23 of Fig; 20;v Fig; 1 is 'a side elevationof a completed ma- Figs; 24, 25.-and 26 are a side elevation, bottom chine"; plan and end view respectively of the reenforcing Fig: 2 is a'longitudinal vertical section; channel for mounting'the body on the base; Fig; 3 i'salcngitudina1- section immediately be- Fig. 27 is a bottom view of the base with a low the top wall'of the operating lever '69 and 30 portion broken" away to more clearly show the thetop'wall of the back s' -of the housing looking construction; down'onthe device; Fig. 28 is a top plan view of the anvil;

Fig; 4 is a detail vertical section of the rear Fig. 29 is a transverse section thereof substaneud portion of the machine showing the staple tially on line 29-Z9 of Fig. 28; slide=in asomewhat advanced position from the :r. Fig; 30" is a section thereof substantially on normal 'position of'Fi'g; 2; line 3G30 of Fig; 29;

Fig. 51s a front elevation of the staple driver Fig. 31 is a similar section substantially on showing theoperating handle in section subline 3l-3l' of Fig. 29; stantially'on'line 5 -5 of'Fig; 2'; Figs. 32 and 33' are a top plan view and side Fig. G is a longitudinal vertical section through 10 elevation respectively of the anvil selecting the frontportion of this handle and driving lever; spring; and

Fig: 7 is a top planview" showing the staple Fig. 34 is a detail section substantially on line slide projected' to the loading-"position and show- 3' 2 of Fig. 2. inga'partof the body in section; The device comprises a body I which is com- Figg 8 'is a partial sideview and partial section 5 posed of 1 upright side plates 2 and 3 forming of the parts showniniFigfi'; side walls connected at their forward ends by a Fig; 9 a transverse section substantially on front wall 4, these three walls being made in one line R-B of 'Fig. 7; piece stamped from sheet metal of suitable gauge Fig. 10 is a bottom plan view of the front and formed or folded to shape with the side walls portion of the slide; 5:) 2 and 3 in substantially parallel relation. At the Fig. 11' is a bottom plan view of the body of rear ends the side walls 2 and 3 have inwardly the device with the staple slide removed; turned integral ears 5 (Figs. 2; 3 and 11) which Figs; 12and- 13 are transverse sections of the abut as shown in Fig, 3' and formv a cross wall lower-part thereof substantially on lines l2-|2 for securing a back cover 5. This cover is and le -l3 respectivelyofFig. 11; stamped from sheet metal and is of substantially inverted U-shape in cross section providing flanges 1 to fit down over the top edges of the side walls 2 and 3, and the top edge portions of the walls 2 and 3 toward the rear of the device may be pressed inwardly or recessed as indicated at 8 (Figs. 2, 3 and 19) to receive these flanges l, at least at the rear portion thereof to give a better appearance and permit the color to be narrowed at the rear end. The top wall of the cover 6 passes down over the ears as shown in Fig. 2 and has an inwardly directed hook 9 engaging under the lower edge of these ears to hold the cover in place. The front end of the top wall of cover 6 is bent downwardly as shown at It to engage over the forward end of transverse ears ll integral with the side Walls 2 and 3 and may be bent back under these ears to hold this cover in place.

At the lower part of the body and between the side walls 2 and 3 is mounted a slide housing [2. This is of substantially rectangular shape in cross section as shown in Figs. 12 and '13, and has vertical side Walls l3 located between the side walls 2 and 3 of the body or housing I and to which they are secured by any suitable means, preferably by spot welding at suitably spaced points along the slide housing as indicated at l4, Fig, 12. The side walls l3 are connected by an integral top'wall l5, and the lower edges of the side walls l3 are bent inwardly to form flanges IE, but their free edges are spaced laterally to form a longitudinal slot I1. At suitable intervals integral lugs I 8 project laterally from the flanges l6 and seat in notches IS in the .lower edges of the side Walls 2 and 3 of the housing to help properly position the slide housing l2.

This slide housing l2 (Figs. 2, 17 and 18) encloses the slide 20 for supporting and guiding the staple strip 2|. This slide is also formed from suitable gauge sheet metal and bent to substantially U-shape forming upright side walls 22 and a connecting bottom wall 23. This slide is mounted within the slide housing l2 so as to slide longitudinally therein, and is supported on the lower flanges l6 of this housing. The lower wall 23 of this slide is provided with downwardly pressed lugs 24 projecting into the longitudinal slot ll between the flanges lfiand are of a width substantially the width. of this slot so as to be guided by the edges of the flanges l6 and retain the slide centrally within the housing, l2. The side walls 22 are spaced from the side Walls 32 of the housing as shown in Fig. 9 to provide spaces for passage of the prongs of the staples and-theside walls of the staple feeding follower 36. Mounted at the forward end of this staple slide 20; F g. 8, and spaced a'short distance from the end of the slide is an upright front plate 25 forming with the front end wall of the slide a guideway 26 for the staples to be driven and also a guide for the staple driver 21. This front plate 25"ex-tends between the side walls 28 of a front plate cover 29, these side walls being connected by an integral front wall 38. This front plate cover 28 is mounted on a substantially U-shaped support 3! which has upright side walls 82 securedto the-inner sides of the side walls 28 by soldering or welding, and the front plate 25 is secured tothe front edges of these side walls and may also be secured to the side walls 28 of the cover by soldering or welding. The lower wall- 33 of this U-shape support 3! may have notches 35 (Figs, '7 and 10) to form clearance for theprongs of the staple should these prongs be bent slightly backward and thus permit passage of the staple under these conditions without catch 40.

clogging the machine. The support 3! may be secured to the slide 2o by any suitable means, but preferably by welding as indicated at 35.

Mounted to slide on the staple slide or guide 29 is a follower 35 of substantially inverted U-shape having side walls 31 extending downwardly on the outer sides of the side walls 22 of the slide with the connecting top wall 38 resting on the top edges of the side walls 22. This top wall is depressed as indicated at 89 in Figs. 8 and 1'7 to form a groove or recess to receive a follower At the forward end of this depressed portion 39 the follower is provided with an opening 4| through which the catch extends under the forward portion of the top wall 38, and the front end of this catch is bent upwardly as shown at 42 and extends through an opening 43 (Figs. 8 and 16) in the top wall 38 of the follower to form a stop catch to engage a stop shoulder 44 formed in the underside of the top wall i5 of the housing l2. This shoulder may be formed by pressing up a portion of this top wall as indicated at 45 (Figs. 2 and 8). As will be seen in Fig. 8 engagement of the lug 42 of the catch with the shoulder 44 will limit outward movement of the slide 20 because on the top edges of the side walls 22 of this slide are p ovided shoulders 46 which engage the rear end of the follower 36. At the rear end of the catch 40 it is bent downwardly as shown at 41, and this wall is forked so that the wall extends downwardly on opposite sides of the follower rod 48. On this rod is a light coil spring 49 engaging this downwardly extending wall 41 and tends to push the follower 36 forwardly to feed forwardly the staple strips and bring the individual staples at the forward end ofthis strip to the driving position under the driver 21 and over the guideway 26. At'its rear end this follower rod 48 is secured to inwardly and transversely extending Walls 50 integral with and forming extensions of the side walls 13 of the slide housing l2 as shown in Figs. 20, 21 and 22, the end of the rod being headed over as indicated at 5|.

During normal operation the slide 28 carrying and guiding the staple strip 2| lies within slide housing l2 as shown in Fig, 2 with the staple guideway 26 under and in alignment with the staple driver 21, and this slide is secured in this position by a pivoted slide release lever 52 forming a catch. This lever is pivoted by means of a cross pin 53 in two upstanding lugs 54 struck up from and integral with the Walls of the slide housing i2'as shown in Fig. 34. The release lever 52 is stamped and formed from heavy sheet metal of suitable gauge, and has two side members 55 connected by an inverted U-shaped cross piece 58 which projects through an opening in the top wall or cover 5 of the body to form a thumb piece to operate the release lever 52. The rear ends of these side walls 55 normally seat in notches 51 formed in the top edges of the side walls 22 of the slide 20 to retain the slide within the housing as shown in Fig. 2, this lever being held in this position by a spring 58 seated at one end on projections 59 of the side Walls 55 as shown in Figs. 2 and 3. The other end of this spring 58 embraces lugs on the rear end portion of a driving lever B l This lever BI is also made of heavy sheet metal of a substantially inverted U-shape in cross section, the side walls E32 of which are bent inwardly toward each other and then side by side to provide the lugs 88 and a seat for the end of the spring 58. Thelever is pivoted on the cross pin 63 extending through the side Walls 62 and the er 21. It is mounted in an opening 93 in the top wall of the base the walls of the opposite sides of this opening being depressed to form supporting lugs 94 on which the anvil rests, the opposite sides of the anvil being bent downwardly to form flanges 95 resting on these lugs 94. The top surface of the anvil is guided against the undersides of the top wall of the base at the opposite sides of the opening 93 as shown in Figs. 28, 29 and 31. A sheet metal spring 96 (Figs. 29, 32 and 33) is notched from its opposite ends as shown at 9! leaving the central portion 98. The forked portions on the opposite sides of this portion 98 are curved upwardly as shown at 99. The free ends of forked portions 99 rest on top of the lugs 99 as shown in Figs. 29 and 39 and the curved tops of these forks 99 engage against the underside of the anvil 88. A selecting pin I99 is placed in the notches 91 extending transversely of the central portion 98 and is supported by this central portion as shown in Figs. 29 and 30 while its opposite free ends are located between the lugs 94 as shown in Figs. 27 and 29. The edges of the flanges 95 of the anvil are provided with spaced notches IM to receive the pin I99 to hold this anvil in the two positions, one when the notches 99' of the anvil are in alignment with the driver and the other when the notches 9| and 92 are in alignment with the driver. Thus the anvil can be slid between the two positions and will be retained therein by the pin I99. To facilitate shifting of the anvil it may be scored or roughened as indicated at I92 in its upper surface to give a suitable finger grip. To enclose the lower portion of the anvil to protect it and also to give a rubber foot for the base of the machine, a rubber block I93 is shaped at its upper side to fit within the front end of the base 89 and it is recessed at its upper side as indicated at I 94 to enclose the supporting devices for the anvil. To retain this rubber foot in place integral lugs I95 are bent downwardly from thetop wall of the base, these being provided when the opening 93 is made in this wall, and they may be forced into the rubber block to hold it in position.

The whole body I is removably secured to the base 89 so that it may be readily attached or detached. For this purpose the rear end portion of the top wall of the base is cut, a pair of laterally spaced ears I96 (Figs. 1 and 14) are bent upwardly therefrom and a transverse pivot pin I91 is mounted therein. Cooperating with this pin to secure 'the body to the base is a reenforcing channel I98 (Figs. 2, 4, 14 and 24 to 26.) This is a stamping of suitable gauge metal of substantially inverted U-shape having a top wall I99 and the side walls II9 being spot welded to downwardly extending ears II9a on side walls 2 and 3 of the body (Figs. 11 and 14) as shown at IIOb. The side walls I ID are provided with an L-shaped or bayonet slot III to receive the pin I91, and at the inner end of this slot is a notch I I2 into which the pin I9'I may seat asshown in Figs. 2 and 4. A body lift spring I I3 is secured to the underside of the top wall of the base by any suitable means, such as a screw'or rivet I I4, and at its free end is cut to form fingers I I5 to engage the under edges of the Walls III] of the reenforcing channel I98 and hold the body upwardly so that the pin I9'I- is seated in the notches H2 and to prevent the body from becoming accidentally detached from the base. These fingers also hold the front end of the body I elevated above the anvil 88 as shown in Figs. 1 and 2 so that the ar,- ticles to be stapled may be inserted. The portion of the spring I I3 between the fingers I I5 is made substantially T-shaped as shown at I I6 (Fig. 27) and is seated in a similarly shaped recess II! in a rubber foot IIB shaped on its upper wall to fit in the rear end portion of the base 89. The fingers I I5 seat in a recess on'a top wall of this rubber foot as shown in Fig. 14 and thus with the portion II6 retain the rubber foot in position. If it is desired to remove the body I from the base all that is necessary is to press downwardly on the rear end portion of the body to depress the side walls IIO away from the pin I91, and then by drawing the body forwardly this pin can be passed out through the slots III removing the body from the base. To mount the body on the base a reverse operation is all that is necessary.

It will thus be seen that this staple driving machine is made almost entirely of press work stamped from suitable gauge metal and formed to shape, and then is assembled principally by spot welding. It is also of simple construction, being composed of relatively few parts, and the fact that it is made of stampings makes it of light weight and strong. To refill with a new strip of staples all that is necessary is to release the lever 52 when the staple guide or slide 29 will be automatically projected a short distance and may be then drawn to the full extended position of Figs. '7 and 8 to permit a new strip of staples 2| to be placed on top of the slide. Then the slide may be pushed back into its normal position of Fig. 2 where it will be retained by the lever 52.

Having thus set forth the nature of our invention, what we claim is:

1. A staple driving machine comprising a body, a staple slide mounted in the lower part of the body to slide forwardly from the body for loading with staples, a releasable catch for normally retaining the slide in the body, a staple guideway for staples to be driven at the front end of the slide, a staple driver operable through the guideway, a hand lever pivoted in the body and connected with the driver for operating it, and a spring reacting between the hand lever and the catch to retain both in their normal positions.

'2. A staple driving machine comprising a sheet metal body having spaced 'side walls, a staple slide mounted in the lower part of the body between the side walls and projectable from the front thereof for loading with staples, a staple guideway at the front end of the slide, means for feeding staples along the slide to the guideway, a staple driver operable in the guideway, a hand lever pivoted in the body formed of sheet metal of substantially inverted U-shape and having notches in the forward ends of the side walls for mounting the driver, and a spring tending to hold the lever and driver in elevated position.

3. In a staple driving machine, a body, a staple slide in the body and a staple guideway at the front of the slide, means for feeding staples along the slide to the guideway, a stapledriver operable in the guideway, a hand lever having spaced upright side walls having notches in their forward ends providing projecting lugs at the lower sides of the notches, said driver having notches in its opposite side edges, and the upper end portion of the driver being seated in the notches in the side walls of the lever with the lugs in the notches in the side walls of the driver.

4. A staple driving machine comprising a sheet metal body having spaced side walls, a staple slide in the lower part of the body having a staple guideway at the forward end thereof, means for feeding staples along the slide to the guideway, a han-d lever pivoted to the sidewalls of sub- :stantially inverted U-shape in cross section, a

staple driver operable in the guideway and connected to the side walls of thehandle, a cross wall :between the side walls of the body, a stop projecting upwardly from said cross wall, the forward end of the top wall of the lever being extended downwardly and rearwardly to engage said stop to limit upward movement of the lever, and a spring for normally holding the lever in elevated position.

5. In a staple driving machine, a body having spaced side walls, a staple slide in the lower part of the body, a staple guideway at the forward end of the slide, means for feeding staples along the slide to the guideway, a staple driver operable through the guideway, an operating lever of sheet metal and of substantially inverted U-shape in cross section having downwardly projecting side walls, means for mounting the driver on the forward ends of the side walls on the lever, the rearward ends of said latter Walls being extended toward each other and then side by side to form a lug, and a spring seated on said lug and tending to hold the lever in elevated position.

6. A staple driving machine comprising a body having spaced side walls, a staple slide mounted between said side walls and movable forwardly from the body for loading of staples, a staple guideway at the front of the slide, a staple driver operable in the guideway, an operating lever pivoted in the body and connected with the driver for operating it, a release lever pivoted in the body and normally engaging a shoulder on the slide to retain it in the body, said operating lever and said release lever having lugs extending toward each other, and a spring mounted on said lugs and tending to move the levers to normal position.

'7. A staple driving machine comprising a body, a staple slide mounted in the body and slidable to a projected position for loading with staples, said slide being of substantially U-shape in cross section, a substantially U-shaped support secured to the forward end of the slide, a front plate mounted on said support and spaced from the end of the slide to form a staple guideway, a front plate cover embracing the plate and secured to the support, a substantially flat staple driver operable in the guideway, and a pivoted lever mounted in the body and connected with the driver to operate it.

8. A staple driving machine comprising a body having spaced side walls provided with notches in their lower edges, a sheet metal substantially rectangular housing mounted in the lower part of the body and having laterally extending lugs seated in said notches, said housing being secured to the side walls, a staple slide mounted in the housing and projectable forwardly therefrom for loading with staples, a staple guideway at the forward part of the slide, a staple driver operable in the guideway, and means for operating the driver.

9. A staple driving machine comprising a sheet metal body having spaced side walls provided with notches in their lower edges, a. sheet metal housing comprising top and side Walls with inwardly projecting flanges at the lower edges of the side walls, said flanges being spaced from each other to provide a guide channel, said flanges having laterally extending lugs seated in said notches and the housing being welded to the side walls of the body, a staple slide mounted in the housing, and projectable therefrom for loading with staples, a staple guideway at the front :of the slide, guide lugs on the slide projecting into the channel, means to ifeed staples along the slide to the guideway, a'staple driver operable in the guideway, andsmeans for operating the driver.

10. A staple driving machine comprisingaa'body ihavingspaced side walls, an elongated slide housing mounted in the lower part of the body, a staple slide mounted in the housing and slidable forwardly in the housing for loading of staples, a staple guideway at the forward end of the slide, a staple driver operable in the guideway, releasable means normally retaining the slide in its innermost position in the housing, a spring to move the slide forwardly when said means is released, and a brake spring carried by the slide and frictionally engaging the housing to retard forward movement of the slide.

11. A staple driving machine comprising a body having spaced sheet metal side walls connected by an integral front wall, a slide housing mounted in the lower part of the body having a top wall, a staple slide mounted in the housing, a staple guideway at the front end of the slide, means for feeding staples along the slide to the guideway, a staple driver operable in the guideway, the forward end of the top wall of the housing being extended upward to form a guide for the driver at the rear thereof, and the lower end of the front wall of the body being extended backward and laterally to form a guide at the front of the driver.

12. A staple driving machine comprising a body having spaced side walls, a slide housing mounted in the body at the lower part thereof, a staple slide mounted in the housing and projectable forwardly therefrom for loading of staples, a staple guideway at the forward end of the slide, a follower on the slide for feeding staples to the guideway, the housing having a rear wall at the inner end of the slide, a follower rod secured to this wall and extending longitudinally of the slide, a spring on the rod tending to advance the follower, a staple driver operable in the guideway, and means for operating the driver.

13. A staple driving machine comprising a body having spaced side walls, an elongated slide housing mounted in the lower part of the body having a top wall, a staple slide mounted in the housing and slidable forwardly in the housing to staple loading position, a staple guideway at the forward end of the slide, a staple driver operable in the guideway, releasable means normally retaining the slide in its innermost position in the housing, a spring to move the slide forwardly when said means is released, and a brake spring carried by the side, said brake spring comprising a looped wire with its sides pivoted in the sides of the slide and its connecting loop portion frictionally engaging the topwall of the housing.

14. A staple driving machine comprising a body having spaced side walls, an elongated slide housing mounted in the lower part of the body, a staple slide mounted in the housing and slidable forwardly in the housing for loading of staples, a staple guideway at the forward end of the slide, a staple driver operable in the guideway, releasable means normally retaining the slide in its innermost position in the housing, said housing having a wall projecting across the inner end of the slide, and a slide ejector spring mounted between the inner end of the slide and said wall of the housing to move the slide forwardly when released.

15. A staple driving 7 machine comprising a sheet metal body having spaced side walls connected by an integral front Wall, a sheet metal slide housing having top, side and bottom walls,

, said housing being located between the side walls of the body and Welded thereto, a staple slide mounted in the housing and projectable from the 

